👷 add concurrency control to docs.yml workflow to prevent overlapping runs

Author: techouse

.github/workflows/docs.yml

@@ -2,13 +2,15 @@ name: Docs
 
 on:
   workflow_dispatch:
-    branches:
-      - main
   workflow_call:
 
 permissions:
   contents: write
 
+concurrency:
+  group: docs-${{ github.ref }}
+  cancel-in-progress: false
+
 jobs:
   docs:
     name: "Docs"